Glass grinding apparatus



FIG. 1 is an upper perspective view of the design;

FIG. 2 is a lower perspective view of the design;

FIG. 3 is a top plan view of the design;

FIG. 4 is a bottom plan view of the design;

FIG. 5 is a front elevation view of the design;

FIG. 6 is a rear elevation view of the design;

FIG. 7 is a right side elevation view of the design; and,

FIG. 8 is a left side elevation view of the design.

The broken lines depict portions of the glass grinding apparatus that form no part of the claimed design. 

CLAIM The ornamental design for a glass grinding apparatus, as shown and described. 